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+//Example 5_17
+clc();
+clear;
+//To find the lattice parameter and atomic diameter 
+lamda=0.171       //units in nm
+theta=30            //units in degrees
+d110=lamda/(2*sin(theta*%pi/180))      //units in nm
+h=1
+k=1
+l=0
+a=d110*sqrt(h^2+k^2+l^2)            //units in nm
+printf("The lattice parameter is a=%.3fnm",a)
+//Assuming the metal is FCC
+a1=0.171*sqrt(3)    //units in nm
+a2=0.148*sqrt(4)    //units in nm
+ad=a1/sqrt(2)         //units in nm
+printf("\n Atomic diameter is %.4fnm",ad)